EP0500521A1 - Ship's propeller. - Google Patents

Ship's propeller.

Info

Publication number
EP0500521A1
EP0500521A1 EP89913259A EP89913259A EP0500521A1 EP 0500521 A1 EP0500521 A1 EP 0500521A1 EP 89913259 A EP89913259 A EP 89913259A EP 89913259 A EP89913259 A EP 89913259A EP 0500521 A1 EP0500521 A1 EP 0500521A1
Authority
EP
European Patent Office
Prior art keywords
blade
propeller
end plates
end plate
chord length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89913259A
Other languages
German (de)
French (fr)
Other versions
EP0500521B1 (en
Inventor
Jong Karel De
Vries Jacob De
Johan Adolf Sparenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stichting voor de Technische Wetenschappen STW
Original Assignee
Stichting voor de Technische Wetenschappen STW
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stichting voor de Technische Wetenschappen STW filed Critical Stichting voor de Technische Wetenschappen STW
Publication of EP0500521A1 publication Critical patent/EP0500521A1/en
Application granted granted Critical
Publication of EP0500521B1 publication Critical patent/EP0500521B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/16—Propellers having a shrouding ring attached to blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H2023/005—Transmitting power from propulsion power plant to propulsive elements using a drive acting on the periphery of a rotating propulsive element, e.g. on a dented circumferential ring on a propeller, or a propeller acting as rotor of an electric motor

Definitions

  • the present invention relates to a ship's propeller provided with propeller blades with end plates at the end remote from the propeller hub and on both sides of the blade.
  • Such a ship's propeller is known.
  • the end plates however have an important disadvantage. Since they are moved with relatively large speed by the liquid, they intend to a large friction resistance. The energy losses occured by this friction resistance can be so large that the mentioned energy profit is counteracted.
  • the invention aims to provide a propeller with end plates at the blade tips, which has a lower friction resistance with respect to the water than the known propeller.
  • these vortices are not always distributed over two end plates , such as at the prior art , but substantial ly over one end plate.
  • the bound vortices present in chord direction at the front side of the blade are namely discharged by the end plate extending to the front edge and the vortices at the back side of the blade by the end plate extending to the back edge.
  • each end plate according to the inventor Since however the width of each end plate according to the inventor is smaller than that of the known single end plate, and its chord length is smaller than the chord length of the known double end plate, a considerable surface decreasement is obtained by the end plates according to the invention with about a factor 0,4. Since moreover the end plates in the intermediate area of the blade tip overlap eachother, it is obtained that in this area occuring limited vortix strength of the blade tip can be distributed over both end plate halves, in such a way that on the front and back edges of these halves the bound vortix strength can go smoothly to zero to avoid danger of cavitation.
  • the ship's propeller can be carried out in such a way that on the spot of the attachment the chord lenghts of each end plate is between 90 % and 45 % of that of the blade tip. Preferable however on the spot of the attachment the chord length of each end plate is between 70 % and 45 % of that of the blade tip.
  • Fig. 1a, 1b show respectively a side and front view of the end of a propeller blade with end plates.
  • Fig. 2 shows the propeller blade according to fig. 1a, 1b perspectively.
  • Fig. 3 shows the vortix model of the propeller blade according to fig. 2.
  • Fig. 4a, 4b and 4c showmediaally an assumed course of the bound vortix strength over respectively blade and end plates.
  • the propeller blade 1 shown in fig. 1a, 1b is at his end (not -shown) attached to the hub (not-shown) and at his other end 2 provided with two end plates 3, 4. These end plates have at the side of the end 2 of the blade a chord length which is smaller than the chord length of that end.
  • the end plate 3 is with his front side adjacent to the front edge 5 of the propeller blade, the end plate 4 is with his back side adjacent to the back edge 6 of the propeller blade.
  • the end plate 3, 4 are overlapping eachother.
  • One and the other is clear from fig. 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Wind Motors (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Turbines (AREA)

Abstract

PCT No. PCT/NL89/00083 Sec. 371 Date Feb. 26, 1992 Sec. 102(e) Date Feb. 26, 1992 PCT Filed Nov. 15, 1989 PCT Pub. No. WO91/07313 PCT Pub. Date May 30, 1991.Ship's propeller having a propeller blade having a leading edge and a trailing edge and a free end, and end plates at the free end extending transversely of the blade on both sides of the blade. The line of attachment to the blade of each of the end plates has a chord length less than the chord length of the blade end and the lines of attachment of the end plates overlap each other partly, one end plate extending to the blade leading edge and the other end plate extending to the blade trailing edge. The end plates have airfoil configuration and have leading edges that extend outwardly and rearwardly of the blade with respect to the direction of movement of the blade.

Description

Ship's propeller
The present invention relates to a ship's propeller provided with propeller blades with end plates at the end remote from the propeller hub and on both sides of the blade.
Such a ship's propeller is known. The end plates at the tip of the propeller blades aim to distribute the free vortices coming from the tip of the blade in broadwise direction (= spandirection) of the end plate, so that the kinetic energy losses occured by these free tip vortices remain as low as possible. The end plates however have an important disadvantage. Since they are moved with relatively large speed by the liquid, they intend to a large friction resistance. The energy losses occured by this friction resistance can be so large that the mentioned energy profit is counteracted. It is also known to provide the blades of a ship's propeller at one side of the tip with an end plate. In order to distribute also in this case the tip vortices in the same extension, the width of this endplate must be equal to the sum of the widthes of the plates present on both sides of the tip. Also in this case the friction resistance with respect to the water will be considerable.
The invention aims to provide a propeller with end plates at the blade tips, which has a lower friction resistance with respect to the water than the known propeller.
This is obtained, in that on the spot of the attachment to the blade the end plates have a chord length less than the chord length of the blade end and are overlapping eachother partly, whereby one end plate is extending to one blade edge and the other end plate is extending to the other blade edge.
Since the bound vortices in chord direction are distributed over the blade tip, the whole blade tip must be covered by one or two end plates in order to obtain the desired effect.
According to the invention these vortices are not always distributed over two end plates , such as at the prior art , but substantial ly over one end plate. The bound vortices present in chord direction at the front side of the blade are namely discharged by the end plate extending to the front edge and the vortices at the back side of the blade by the end plate extending to the back edge. By equalizing the sum of the widthes of the end plates to that of both known end plates or to the width of the single end plate the same favourable distribution of the discharge vortices in broadwise direction is obtained. Since however the width of each end plate according to the inventor is smaller than that of the known single end plate, and its chord length is smaller than the chord length of the known double end plate, a considerable surface decreasement is obtained by the end plates according to the invention with about a factor 0,4. Since moreover the end plates in the intermediate area of the blade tip overlap eachother, it is obtained that in this area occuring limited vortix strength of the blade tip can be distributed over both end plate halves, in such a way that on the front and back edges of these halves the bound vortix strength can go smoothly to zero to avoid danger of cavitation.
The ship's propeller can be carried out in such a way that on the spot of the attachment the chord lenghts of each end plate is between 90 % and 45 % of that of the blade tip. Preferable however on the spot of the attachment the chord length of each end plate is between 70 % and 45 % of that of the blade tip.
The smallest surface area of both end plates is obtained if on the spot of the atttachment the chord lengths of both end plates are the same.
A special favourable effect can be obtained if the form of the propeller is optimalisized in the way as disclosed in International Ship building Progress, part 34, July 1987 Nr. 395, (An optimum screw propeller with end plates) by J.A. Sparenberg and J. de Vries. The there determined optimal circulation distribution with respect to a propeller provided with end plates can now be applied to determine the further form of the end plates according to the invention. The chord lenghts of the end plates are chosen proportional to said optimal circulation distribution, so that danger for cavitation owing to too large underpresures is avoided. In this respect it is remarked that not the position or angle with respect to the flow of front edge and back edge of the end plate halves are important, but the chord lengths of the end plates.
Finally it is remarked that it is not important whether the front end plate is present at the high pressure or at the low pressure side, provided the back half is present at the other side of the blade. The invention will now be explained with reference to an embodiment.
Fig. 1a, 1b show respectively a side and front view of the end of a propeller blade with end plates.
Fig. 2 shows the propeller blade according to fig. 1a, 1b perspectively.
Fig. 3 shows the vortix model of the propeller blade according to fig. 2.
Fig. 4a, 4b and 4c show grafically an assumed course of the bound vortix strength over respectively blade and end plates.
The propeller blade 1 shown in fig. 1a, 1b is at his end (not -shown) attached to the hub (not-shown) and at his other end 2 provided with two end plates 3, 4. These end plates have at the side of the end 2 of the blade a chord length which is smaller than the chord length of that end. The end plate 3 is with his front side adjacent to the front edge 5 of the propeller blade, the end plate 4 is with his back side adjacent to the back edge 6 of the propeller blade. In the intermediate area 7 of the end 2 the end plate 3, 4 are overlapping eachother. One and the other is clear from fig. 2.
The vortix model shown in figure 3 (seen under the same angle as fig. 2) the propeller blade is indicated by the bound vortices 8 and the end plates 3, 4 by the bound vortices 9 respectively 10. These last vortices continue in the clearing off free vortices 11
respectively 12. As known the free vortices 11, 12 distributed in such a way give rise to lower losses of kinetic energy compared with a more concentrated clearing off tip vortix which in general is formed at propeller blades without end plates. From this figure it is clear that the end plates 3, 4 do not need to extend over the whole chord length of the end 2, the vortices 8 present at the front side of the blade are guided away as vortices 9 of the end plate 3, the vortices present on the back side of the blade as vortices 10 of the end plate 4.
In fig. 4 an exampel of an assumed course of the bound vortix strength over the blade tip chord c is indicated and from the front and to the back end seen in the flow direction. In fig. 4b, c their belonging assumed course is indicated of the bound vortix strength 3 respectively 4 of the front end plate and the back end plate, as well as over the chord of the blade end. At the overlapping of both end plates here assumed between 0,35 c and 0,5 c a lineair course is possible. Further to both end plates equal vortix strength must be discharged. The above mentioned can be obtained if it is satisfied to the following two conditions:
1e) 4
2e) surface figure 4b = surface figure 4c.

Claims

C L A I M S
1. Ship's propeller provided with propeller blades with end plates at the end remote from the propeller hub and on both sides of the blade, characterized in that on the spot of the attachment to the blade the end plates have a chord length less than the chord length of the blade end and are overlapping each other partly, whereby one end plate is extending to one blade edge and the other end plate is extending to the other blade edge.
2. Ship's propeller according to claim 1, characterized in that on the spot of the attachment the chord length of each end plate is between 7 % and 45 % of the chord length of the blade tip.
4. Ship's propeller according to one of the preceding claims, characterized in that on the spot of the attachment the chord lenghts of both end plates are the same.
5. Ship's propeller according to one of the preceding claims whereby the circulation distribution along blades and end plates is optimal, characterized in that the chord length of the end plates is proportional to the optimal circulation distribution.
EP89913259A 1989-11-15 1989-11-15 Ship's propeller Expired - Lifetime EP0500521B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL1989/000083 WO1991007313A1 (en) 1989-11-15 1989-11-15 Ship's propeller

Publications (2)

Publication Number Publication Date
EP0500521A1 true EP0500521A1 (en) 1992-09-02
EP0500521B1 EP0500521B1 (en) 1994-06-08

Family

ID=19853956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89913259A Expired - Lifetime EP0500521B1 (en) 1989-11-15 1989-11-15 Ship's propeller

Country Status (6)

Country Link
US (1) US5312228A (en)
EP (1) EP0500521B1 (en)
JP (1) JPH05501528A (en)
AT (1) ATE106817T1 (en)
DE (1) DE68916040T2 (en)
WO (1) WO1991007313A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPM987994A0 (en) * 1994-12-06 1995-01-05 Stealth Propulsion International Limited Improvements to propellers
US5405243A (en) * 1990-12-14 1995-04-11 Stealth Propulsion Pty. Ltd. Propeller with shrouding ring attached to blade
AU726352B2 (en) * 1994-12-06 2000-11-02 Spi (R & D) Pty. Ltd. Propeller with annular connecting element interconnecting tips of blades
US6000907A (en) * 1998-08-24 1999-12-14 Bic; Adrian Fluid-activatable vane for a fluid turbine
CN100484831C (en) * 2000-07-13 2009-05-06 韩玮 Fan-type fluid transportation and power propulsion propeller
US7007184B2 (en) * 2000-09-08 2006-02-28 Hewlett-Packard Development Company, L.P. DIMM connector accomodating sideband signals for battery status and/or control
AT507091B1 (en) * 2008-09-22 2010-02-15 Walter Enthammer TURBOMACHINE
AU2016246617B2 (en) * 2015-04-08 2020-03-19 Horton, Inc. Fan blade surface features
TWI726684B (en) * 2020-04-15 2021-05-01 宏碁股份有限公司 Fan

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515268A (en) * 1922-12-27 1924-11-11 Cloverleaf Propeller Company Propeller
GB262349A (en) * 1926-07-07 1926-12-09 John Gould Improvements in and relating to screw propellors
US1703412A (en) * 1926-08-09 1929-02-26 Thompson Propeller Securities Screw propeller
US2086307A (en) * 1935-06-08 1937-07-06 Stewart Archibald Byers Screw propeller and the like
US2104306A (en) * 1935-07-10 1938-01-04 Mcleod George Harnett Screw propeller
DE899180C (en) * 1942-10-21 1953-12-10 Gustav Woehrn Propeller with guide wings
ES444150A1 (en) * 1976-01-08 1977-05-16 Espanoles Astilleros Marine screw
GR71888B (en) * 1979-11-02 1983-08-05 Espanoles Astilleros
JPS6018599B2 (en) * 1980-07-10 1985-05-11 三井造船株式会社 marine propeller
JPS58194689A (en) * 1982-05-08 1983-11-12 Mitsui Eng & Shipbuild Co Ltd Manufacture of propeller for ship
FR2623569A1 (en) * 1987-11-19 1989-05-26 Snecma VANE OF COMPRESSOR WITH DISSYMMETRIC LETTLE LETCHES

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9107313A1 *

Also Published As

Publication number Publication date
DE68916040T2 (en) 1995-02-02
EP0500521B1 (en) 1994-06-08
WO1991007313A1 (en) 1991-05-30
ATE106817T1 (en) 1994-06-15
DE68916040D1 (en) 1994-07-14
US5312228A (en) 1994-05-17
JPH05501528A (en) 1993-03-25

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